EP0843476A1 - Verfahren und Dekoder zur Datenverarbeitung in Teletextseiten - Google Patents

Verfahren und Dekoder zur Datenverarbeitung in Teletextseiten Download PDF

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Publication number
EP0843476A1
EP0843476A1 EP96118501A EP96118501A EP0843476A1 EP 0843476 A1 EP0843476 A1 EP 0843476A1 EP 96118501 A EP96118501 A EP 96118501A EP 96118501 A EP96118501 A EP 96118501A EP 0843476 A1 EP0843476 A1 EP 0843476A1
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EP
European Patent Office
Prior art keywords
data
block
pages
stored
blocks
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP96118501A
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English (en)
French (fr)
Inventor
Sandor Gyarmati
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Deutsche Thomson Brandt GmbH
Original Assignee
Deutsche Thomson Brandt GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Deutsche Thomson Brandt GmbH filed Critical Deutsche Thomson Brandt GmbH
Priority to EP96118501A priority Critical patent/EP0843476A1/de
Priority to EP97119379A priority patent/EP0843477A3/de
Priority to US08/970,902 priority patent/US5910821A/en
Priority to JP9315228A priority patent/JPH10164522A/ja
Priority to CN97123123.0A priority patent/CN1120627C/zh
Publication of EP0843476A1 publication Critical patent/EP0843476A1/de
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/08—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division
    • H04N7/087—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division with signal insertion during the vertical blanking interval only
    • H04N7/088—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division with signal insertion during the vertical blanking interval only the inserted signal being digital
    • H04N7/0882—Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band, e.g. by time division with signal insertion during the vertical blanking interval only the inserted signal being digital for the transmission of character code signals, e.g. for teletext

Definitions

  • the present invention relates to a method and a decoder for the processing of data within teletext pages which can be used especially for electronic programme guides.
  • VBI lines For the transmission of additional data on a television channel it is well known to use the lines of the vertical blanking interval, known as VBI lines.
  • the transmitted data are usually organized in pages of about 1 kByte size.
  • various methods like the TOP method For a user-friendly selection of a special page various methods like the TOP method have been developed.
  • the data are related to different kinds of information and include listings of programme information.
  • EPG electronic programme guides
  • the additional data shall be broadcasted within the teletext data stream in a compatible manner.
  • the broadcasting of additional data like the data for an EPG can be provided in sub-pages of the teletext page 1DF but also in sub-pages of another page when defined so in the Magazine Inventory Page (MIP).
  • MIP Magazine Inventory Page
  • the VBI can be used more effectively.
  • the most important data shall be transmitted in stream1, where the pages apply the 20ms-rule known from normal teletext in order to make these pages available also for older teletext decoders.
  • stream2 further pages are transmitted, which do not apply to the 20ms-rule.
  • Stream1 pages and stream2 pages are transmitted in irregular order and are identified by a specific value transmitted in the page sub-code.
  • the transmitted data are organized in data blocks of 2 kByte maximum size. Therefore, due to the page size of about 1 kByte blocks from different streams may interrupt each other.
  • the inventive method consists of the processing of data within teletext pages, wherein the data are organized in data blocks, wherein the pages are stored sequentially in two different buffers and that the data of a first page stored in the first buffer are processed during the data of a second page are acquiring into the second buffer.
  • the data are transmitted within two streams of pages, wherein the pages of the two streams are stored in both of the two different buffers.
  • the blocks of the pages transmitted in the first stream are stored in a first block buffer, the blocks of the pages transmitted in the second stream in a second block buffer.
  • control block size Preferentially after decoding the control block size the complete control block is Hamming decoded and the interpretation of data elements and their filtering is separated in a second process.
  • the data are used in order to provide a electronic programme guide.
  • the inventive decoder for the processing data within teletext pages comprises an acquisition unit, which seperates the data pages from the transmitted teletext pages and two different page buffers, in which the seperated pages are sequentially stored.
  • the decoder is further comprising two different block buffers, in which the data blocks are stored.
  • the decoder further comprises one or more processors for block decoding.
  • Fig. 1 a block-diagram of the inventive data processing is shown.
  • the data pages which are typically transmitted as 1DF xxxx, are acquired by the acquisition unit HW and are stored sequentially in two different page buffers PA and PB. Both pages may originate from stream1 or stream2.
  • page A When page A is completely acquired, data in buffer PA will be processed completely. During this time page B will be acquired into buffer PB. Page A processing will be finished before page A restarts to overload again buffer PA.
  • buffer PB will immediately started to be processed.
  • the page processing is performed when all Blocks are processed.
  • the last block in a page may be not completed and be continued on the next page received in buffer PA or PB continuing the same stream (stream1 or stream2).
  • stream1 or stream2 the same stream
  • a large page buffer with a capacity for a number of pages can be used for each of the 2 streams. This requires relatively large memory and does not totally overcome the problem with interrupted blocks.
  • the transmitted data are organized in blocks with the following structure:
  • the block decoding can be performed in various forms.
  • One possibility can be to start the interpretation only when all Hamming coded bytes are error free received. After a number of periodic reception of a block more and more errors will disappear under the assumption that non correctable Hamming errors do not appear each time in the same bytes. This concept implies that error free bytes are prevented from overwriting by new data. Therefore, refreshing of data cannot be applied easily.
  • the transmitted data block TDB includes the block header H and several relevant data elements E1 to E4, wherein E2 and E3 are part of a data loop marked by the arrow.
  • E2 and E3 are part of a data loop marked by the arrow.
  • the hamming decoding is always applied in steps a) b) c). Only bytes carrying relevant data elements or parts of relevant data elements are required to be error free after hamming 8/4 decoding, therefore bytes carrying non-relevant data parts will not be hamming decoded and interpreted at all.
  • control block size After decoding the control block size the complete control block is Hamming decoded with an error flag for each byte. The interpretation of data elements and their filtering is then separated in a second process.
  • the block processing is stopped and it is waited for the next complete error free one. Furthermore, it is checked if a decoded, interpreted and filtered version of the current block already exists in the data base. If an already existing block can be found, error free elements which can be unambiguously identified (their position may change in the transmitted block, if a data loop becomes longer, for instance one sorting criteria is added) may overwrite the same elements in the block received previously.
  • the invention can be used e.g. in TV receivers and VCRs or multi-media PCs equipped with a video/teletext capture card.

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Television Systems (AREA)
  • Television Signal Processing For Recording (AREA)
EP96118501A 1996-11-19 1996-11-19 Verfahren und Dekoder zur Datenverarbeitung in Teletextseiten Withdrawn EP0843476A1 (de)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP96118501A EP0843476A1 (de) 1996-11-19 1996-11-19 Verfahren und Dekoder zur Datenverarbeitung in Teletextseiten
EP97119379A EP0843477A3 (de) 1996-11-19 1997-11-06 Verfahren und Dekoder zur Verarbeitung von Daten in Teletextseiten
US08/970,902 US5910821A (en) 1996-11-19 1997-11-14 Method and decoder for the processing of data within teletext pages
JP9315228A JPH10164522A (ja) 1996-11-19 1997-11-17 テレテキストページ内のデータ処理方法及びデコーダ
CN97123123.0A CN1120627C (zh) 1996-11-19 1997-11-19 处理图文电视页面内数据的方法和译码器

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP96118501A EP0843476A1 (de) 1996-11-19 1996-11-19 Verfahren und Dekoder zur Datenverarbeitung in Teletextseiten

Publications (1)

Publication Number Publication Date
EP0843476A1 true EP0843476A1 (de) 1998-05-20

Family

ID=8223414

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96118501A Withdrawn EP0843476A1 (de) 1996-11-19 1996-11-19 Verfahren und Dekoder zur Datenverarbeitung in Teletextseiten

Country Status (4)

Country Link
US (1) US5910821A (de)
EP (1) EP0843476A1 (de)
JP (1) JPH10164522A (de)
CN (1) CN1120627C (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0843477A2 (de) * 1996-11-19 1998-05-20 Deutsche Thomson-Brandt Gmbh Verfahren und Dekoder zur Verarbeitung von Daten in Teletextseiten

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6377308B1 (en) * 1996-06-26 2002-04-23 Intel Corporation Method and apparatus for line-specific decoding of VBI scan lines
US6031577A (en) * 1997-07-10 2000-02-29 Thomson Consumer Electronics, Inc. System for forming and processing program specific information containing text data for terrestrial, cable or satellite broadcast
GB9826697D0 (en) * 1998-12-05 1999-01-27 Philips Electronics Nv Television receiver
GB9826698D0 (en) * 1998-12-05 1999-01-27 Philips Electronics Nv Television receiver
KR20010018975A (ko) * 1999-08-24 2001-03-15 구자홍 티브이의 텔레텍스트 처리장치 및 방법
FR2818857A1 (fr) * 2000-12-21 2002-06-28 St Microelectronics Sa Procede et dispositif associe de memorisation de sous pages teletexte
US7272515B2 (en) * 2004-03-16 2007-09-18 Abb Technology Ag Digital signal processor implementation of high impedance fault algorithms
KR20070038549A (ko) 2004-07-26 2007-04-10 코닌클리즈케 필립스 일렉트로닉스 엔.브이. 향상된 쏘잉 루프를 가진 웨이퍼와 칩
TWI266539B (en) * 2005-01-13 2006-11-11 Via Tech Inc Decoding device with multi-buffers
CN100493193C (zh) * 2006-12-08 2009-05-27 北京中星微电子有限公司 对实时数码视频影流进行缓存控制的方法和装置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994029811A1 (en) * 1993-06-07 1994-12-22 Scientific-Atlanta, Inc. Electronic program guide and text channel data controller
EP0742669A1 (de) * 1995-05-10 1996-11-13 Matsushita Electric Industrial Co., Ltd. Anzeigesystem für Fernsehgeräte

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4239351C1 (de) * 1992-11-24 1994-02-24 Inst Rundfunktechnik Gmbh Verfahren zum Empfangen von Teletextdaten
JPH07203396A (ja) * 1993-12-28 1995-08-04 Sony Corp 字幕データ復号化装置
DE4405020C1 (de) * 1994-02-17 1995-01-26 Inst Rundfunktechnik Gmbh Verfahren zum Empfangen von in einem Fernsehsignal übertragenen Daten

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994029811A1 (en) * 1993-06-07 1994-12-22 Scientific-Atlanta, Inc. Electronic program guide and text channel data controller
EP0742669A1 (de) * 1995-05-10 1996-11-13 Matsushita Electric Industrial Co., Ltd. Anzeigesystem für Fernsehgeräte

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
BENOIT H: "UN DECODEUR DE TELETEXTE WST]", ELECTRONIQUE RADIO PLANS, no. 521, 1 April 1991 (1991-04-01), pages 53 - 59, XP000225168 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0843477A2 (de) * 1996-11-19 1998-05-20 Deutsche Thomson-Brandt Gmbh Verfahren und Dekoder zur Verarbeitung von Daten in Teletextseiten
EP0843477A3 (de) * 1996-11-19 1998-10-14 Deutsche Thomson-Brandt Gmbh Verfahren und Dekoder zur Verarbeitung von Daten in Teletextseiten

Also Published As

Publication number Publication date
CN1120627C (zh) 2003-09-03
CN1190847A (zh) 1998-08-19
JPH10164522A (ja) 1998-06-19
US5910821A (en) 1999-06-08

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